ArkInventory allows you to set up a rule like this
outfit(name of outfit)
So, perhaps if Combuctor detects CG, ItemRack, or Outfitter (maybe Wardrobe, too - does anyone use that anymore?) present, it creates a side tab for outfits. Then the bottom tabs for that could be set names. Eh... Some people have quite a few sets... So maybe it could just encompass every item you have saved to a set, or you could right-click the Outfits tab to get a drop down populated with your set names.
edit: forgive me if it already does this, Tuller, but could hovering over filter tabs highlight items the same way hovering over bags does? That would help distinguish, say, Boots you have in your inventory but don't have assigned to a set - so you knew that you could sell them. Since switching from the all view to a filter view hides everything not covered by that filter.